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Property, plant and equipment - Depreciation expense (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Property, Plant and Equipment [Line Items] |  |
Depreciation expense | $ 7,487 | $ 7,175
Insurance and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation expense | 2,366 | 2,316
Railroad, Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation expense | $ 5,121 | $ 4,859

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- Definition Amount, excluding lessor's underlying asset for which right to use has been conveyed to lessee under operating lease, of depreciation expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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- Details
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- Details
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